I'll repeat again, make SURE the screw caps' vent holes are OPEN! On Vermins' Batteries-Plus battery, the holes were indented, but NOT punched out. On a 2 Amp, 24 Hour charge, it blew half the top of the CASE OFF!
DON'T try to blow through them with yo' MOUTH, it tastes FUNNIE! If you gonna' say, "YOU SHOULD HAVE TAKEN THE CAPS OFF"--Save your breath, I cain't HEAR YOU (HUH?)
Also, NEVER hammer the terminals onto the posts, it'll break the seal around the posts & that one will always grow FUZZY GUNGER, around it & PFFFFFT!-DEAD.
I KNOW I repeat stuff a LOT, just trying to prevent injuries I have had, from CARELESS STUPIDITY.
Bill W.